Lubricating arrangement for fuel injection pump



w. J. GEWINNER 2,893,513 LUBRICATING ARRANGEMENT FOR FUEL INJECTION PUMP July 7, 1959 WALTER d. GEM/INNER.

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LUBRICATING ARRANCEMENT F OR FUEL INJECTIONPUMP I Filed May 1, 1957 2 Sheets-Sheet 2 I I w/ q a 2 1 a :1 mum .2 ff/ m: HIIHI N .i A5

INVENTOR.

WALTER J GEWINN E12 ATTQP/VEY United States Patent Ofiice 2,893,513 iatented July 7, 1959 LUBRICATING ARRANGEMENT FOR FUEL INJECTION PUMP Application May 1, 1951, Serial No. 656,318

4 Claims. c1. 184-6) This invention relates to fuel injection pumps of the reciprocating piston type and has particular reference to a new and improved means for lubricating the tappets for actuating said pistons. I

An object is to provide a lubrication system for fuel injection pumps of the type set forth, which system is relatively simple in construction, yet efficient in operation.

Another object is to provide a new and improved means for lubricating all of the tappets of the fuel injection pump simultaneously,

Another object is to provide a lubricating means for the tappets of a fuel injection pump, which arrangement is relatively simple and economical in construction and efficient in operation.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings. It will be understood that changes may be made in the details of construction and arrangement of parts shown and described without departing from the spirit of the invention as set forth in the accompanying claims, as the preferred form has been given by way of illustration only.

Referring to the drawings:

Fig. l is a longitudinal sectional view of a fuel injection pump embodying the invention;

Fig. 2 is a sectional view of the invention taken on line 22 of Fig. 1, looking in the direction of the arrows; and

Fig. 3 is a side view of one of the tappets.

Referring more particularly to the drawings wherein similar reference characters designate corresponding parts throughout, the pump shown embodying the invention comprises a housing having a cylinder or barrel 11 with the bore 12, in which is mounted for reciprocation the piston or plunger 13.

For eifecting reciprocation of the plunger, a cam 14 is provided on the cam shaft 15 for each of the pistons 13.

Intermediate each of the pistons or plungers 13 and its respective cam 14 is positioned a tappet, referred to generally as at 16 and which comprises a connecting portion 17, which is operatively connected to the adjacent end of piston or plunger 13 and is operatively connected to the tappet body 18, with the timing spacer 19 positioned between the portion 17 and tappet body 18.

The tappet body 18 is provided with a pin or pivot 19a on which is mounted the roller 20, which is adapted to engage the cam 14.

The housing 10 is provided with the lubricating oil inlet 20a adapted to be connected to the engine pressure feed lubricating oil system by suitable tubing to permit lubricating oil entry into the injection pump through the hole 21 in the pump housing, which hole communicates by means of duct 23a, horizontal groove 26a and duct 23 with a common duct 22 from which individual ducts or ports 23 lead to each tappet bore and assembly. This common duct is interrupted by plug 25, which is so drilled as to introduce a loop flow of the lubricating oil to the tappet bore and return to the common duct 22 to enable reciprocating action of the tappet assembly to interrupt the continuous flow of the lubricating oil, causing intermittent feed of the tappets. This intermittent feed of lubricating oil to the tappets is desired both to obviate reduction of lubricating oil pressure to a level dangerous to the engine and to reduce oil flow to a quantity adequate for tappet lubrication without it becoming a problem of draining through the injection pump.

The tappets 18 are provided on their periphery with the interconnecting horizontal groove 26 and vertical groove 27. The horizontal groove is for the purpose of registry with duct 23, giving intermittent access, twice per cycle of reciprocation, due to pump cam rotation, to the lubricating oil. The vertical groove 27 is in constant communication with duct 23 and with the auxiliary duct 28 to the tappet bore from the common duct 22 beyond plug 25. Thus, the intermittent lube oil supply pulses feed each individual tappet a measured quantity of oil. The tappet pin 19a has a circumferential groove 29 in the area of its tappet shell bearings, with a duct 30 therefrom to the center location of the tappet roller 20. The lube oil thus gains access to the tappet roller bushing, which is the area of maximum loading and subject to peak stress necessitating optimum and positive lubrication.

From the foregoing it will be seen that I have provided new and improved means for obtaining all of the objects and advantages of the invention.

I claim:

1. In a device of the character described, a housing having a plurality of aligned bores, a piston mounted for reciprocation in each of said bores, cam means for elfecting reciprocation of said pistons in said bores, a tappet intermediate each of said pistons and said cam means, a lubricant duct in said housing substantially normal to said bores, said duct communicating with each of said bores, said housing having passage means communicating with said lubricant duct for supplying lubricant to said lubricant duct at a point between the end of said duct and the adjacent tappet, passage means for directing lubricant received in said lubricant duct from said supply passage only to said adjacent tappet, supply passage means for supplying lubricant from said adjacent tappet to said lubricant duct and passage means for delivering lubricant from said lubricant duct to each of the remaining tappets.

2. In a device of the character described, a housing having a plurality of aligned bores, a piston mounted for reciprocation in each of said bores, cam means for eifecting reciprocation of said pistons in said bores, a tappet intermediate each of said pistons and said cam means, a lubricant duct in said housing substantially normal to said bores, said duct communicating with each of said bores, said housing having first passage means communicating with said lubricant duct and with a source of lubricant for supplying lubricant to said lubricant duct at a point between the end of said duct and the adjacent tappet, second passage means connecting said adjacent tappet and said lubricant duct for directing lubricant received in said lubricant duct from said first passage means only to said adjacent tappet, supply passage means for supplying lubricant from said adjacent tappet to said lubricant duct and further passage means connecting said lubricant duct with each of the remaining tappets for delivering lubricant from said lubricant duct to each of said remaining tappets, and means on said adjacent tappet for intermittently communicating with said lubricant duct through said second passage means.

3. In a device of the character described, a housing having a plurality of aligned bores, a piston mounted for reciprocation in each of said bores, cam means for effecting reciprocation of said pistons in said bores, a tappet intermediate each of said pistons and said cam means, a lubricant duct in said housing substantially normal to said bores, said duct communicating with each of said bores, saidhousing having first passage means communicating 'with said lubricant duct and with a source of lubricant for supplying lubricant to said lubricant duct at a point between the end of said duct and the adjacent tappet, second passage means connecting said adjacent tappet and saidjlubricant duct for directing lubricant received in said lubricant duct from said first passage means only to said adjacent tappet, supply passage means for supplying lubricant from said adjacent tappet to said lubricant duct and further passage means connecting said lubricant duct with each of the remaining tappets for delivering lubricant from said lubricant duct to each of said remaining tappets, and means on said adjacent tappet for intermittently communicating with said lubricant duct through said second passage means, and means on said adjacent tappet communicating at, all times with said lubricant duct.

4. Ina device of the character described, a housing having'a plurality of aligned bores, a piston mounted for reciprocation in each of said bores, cam means for etfecting reciprocation of said pistons in said bores, a tappet intermediate eachof said pistons and said cam means, a lubricant duct in said housing substantially normal to said bores, said duct communicating with each of said bores, said housing having first passage means communicating with said lubricant duct and with a source of lubricant for supplying lubricant to said lubricant duct at a point between the endof said duct and the adjacent tappet, second passage means connecting said adjacent tappet and said lubricant duct for directing lubricant received in said lubricant duct from said first passage means only to said adjacent tappet, supply passage means for supplying lubricant from said adjacent tappet'to said lubricant duct and further passage means connecting said lubricant duct with each of the remainingtappets for delivering lubricant from said lubricant duct to each of said remaining tappets, and means on said adjacent tappet for intermittently communicating with said lubricant duct through said second passage means, and means on said adjacent tappet communicating at all times with said lubricant duct, said tappets each having a roller and tappet pin therefor, said tappet pins each;having passage means for supplying lubricant to the bearing surface of said roller between said pin and roller and bearing surfaces between said pin and tappet in the tapped shell on opposed sides of said roller.

References Cited in the file of this patent UNITED STATES PATENTS 

